Metals -> High-temperature or heat-resistant steel and alloy -> Relaxation-resistant steel Characteristics of the material 30KHM ( 30HM, 30ХМ ).
Material : 30KHM ( 30HM, 30ХМ ) Substitute: 35ХМ, 35ХРА Classification : Relaxation-resistant steel
Chemical composition in % of the material 30KHM ( 30HM, 30ХМ ) . C Si Mn Ni S P Cr Mo Cu 0.26 - 0.33 0.17 - 0.37 0.4 - 0.7 max 0.3 max 0.035 max 0.035 0.8 - 1.1 0.15 - 0.25 max 0.3
Temperature of critical points of the grade 30KHM ( 30HM, 30ХМ ).
Ac1 = 757 , Ac3 (Acm ) = 807 , Ar3 (Arcm ) = 763 , Ar1 = 693
Mechanical properties under Т=20o С of the material 30KHM ( 30HM, 30ХМ ) .
Assortment
Dimension
Direct.
s в
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Forging to 100 550 300 18 45 Annealing 860 - 880o C, Forging 100 - 150 600 350 16 45 400 Normalizing 860o C, Bar 930 735 11 45 780 Guenching 880o C, oil, Drawing 540o C, water,
Brinell hardness of the material 30KHM ( 30HM, 30ХМ ) (annealing) , HB 10 -1 = 229 MPa
Physical properties of the material 30KHM ( 30HM, 30ХМ ) . T E 10- 5 a 10 6 l r C R 10 9 Grade MPa 1/Grade Watt/(m·Grade) kg/m3 J/(kg·Grade) Ohm·m 20 2.08 7820 270 100 2.07 12.3 41.9 7800 462 200 2.04 12.6 40.7 7770 334 300 1.97 12.9 39.6 7740 425 400 1.88 13.9 38.4 7700 524 500 1.75 14.4 7660 628 600 1.6 14.6 757 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 30KHM ( 30HM, 30ХМ ) . Weldability: limited weldability. Flakes : weakly predisposed Temper brittleness: not predisposed
Specification :
Mechanical properties :
s в - Tensile strength , [MPa]
s T - Yield stress, [MPa]
d 5 - Specific elongation at fracture , [ % ]
y - Reduction of area , [ % ]
KCU - Impact strength , [ kJ / m2 ]
HB - Brinell hardness , [MPa]
Physical properties :
T - Test temperature , [Grade]
E - Young modulus , [MPa]
a - Coefficient of linear expansion
(range 20o - T ) , [1/Grade]
l - Termal (heat) condition coefficient , [Watt/(m·Grade)]
r - Density , [kg/m3 ]
C - Specific heat
( range 20o - T ), [J/(kg·Grade)]
R - Electrical resistance , [Ohm·m]
Weldability :
without limitations - welding is done without heating and subsequent heat treeting
limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing
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